Malicious PDF — malware analysis report

Static analysis result for SHA-256 b328eac75504ab19…

MALICIOUS

PDF

68.2 KB Created: 2021-03-22 01:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b3b152d05d1a436921012781653199cf SHA-1: 645a44ef62f99676a4d664cae6ee3162b9b2cd41 SHA-256: b328eac75504ab19811b4c12257e14eb513f10e2e2a65944db9cd8aecace0649
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a specific URL, reinforcing the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=cayenne+manual+transmission+for+sale PDF link annotation
    • http://bajifepeselok.sportsontheweb.net/tropismo_en_las_plantas.pdfIn PDF document text
    • http://bellissimo.online/maxajabuvirinibavige98t4.pdfIn PDF document text
    • http://bratskpravojur.ru/26387255449dd237.pdfIn PDF document text
    • http://ctuxuu.com/kamuniriwejuvawegat7d6q2.pdfIn PDF document text
    • http://btsworld.org/factoring_greatest_common_factor_worksheet_answers0h5iu.pdfIn PDF document text
    • https://womizanoxagas.weebly.com/uploads/1/3/1/6/131607010/beluruk-wosuzoreb-zumed-sixakujar.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/this_is_where_the_world_ends_sparknotes.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/bluebeam_revu_tutorial_2019.pdfIn PDF document text
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/3332239.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/pestel_analysis_of_egypt_2020.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/venivilutujut.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/jotorosojesofo_xisizitavepep_refaforow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazizaxaf.atwebpages.com/12907212703.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/what_is_the_name_of_the_next_keeper_of_the_lost_cities_book.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_8e88797e326e454aa751fbffcd96efe1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/minizujatopu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/someone_like_you_adele_live_performance.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/axis_fd_interest_rates.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/58001075003.pdfIn PDF document text
    • http://vatonafikokex.atwebpages.com/telangana_breathless_song_lyrics.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_513261e43d8c46998499ea61a6677a87.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_accb190b72744b01b5285514ea5970f2.pdf?index=trueIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/55210199554.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_62ea526af57d4a8ab7f11fff4f76bff2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 4920 bytes
SHA-256: c040d8d5033875cc67eaa0057c5a7f430de4a38534fd98b88aca0072facb605e
font_01_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10584 bytes
SHA-256: dba5d3fb3e50f6ea96cb4574a4836257f7273103e50586f052fca5a38bca38ca